Adult content refers to materials and media intended for mature audiences and can include, but is not limited to nudity and content with explicit reference to human sexuality.
You can host adult-oriented websites at Hostinger, taking the following into consideration:
All hosted materials must comply with applicable laws and regulations, including intellectual property rights
You are not allowed to host content of illegal nature or that promotes or encourages any illegal activity
You are not allowed to host content that promotes, encourages or engages in child pornography or the exploitation of children
Since these type of websites can have high resource requirements, the best option is to choose a Cloud or VPS hosting plan.